CVE-2021-3748

HIGH

QEMU - Use After Free

Title source: llm
STIX 2.1

Description

A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.

References (8)

Core 8
Core References
Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1998514
Patch, Third Party Advisory x_refsource_misc
https://ubuntu.com/security/CVE-2021-3748
Mailing List, Patch, Third Party Advisory x_refsource_misc
https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20220425-0004/
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202208-27
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html

Scores

CVSS v3 7.5
EPSS 0.0003
EPSS Percentile 10.3%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Details

CWE
CWE-416
Status published
Products (9)
canonical/ubuntu_linux 18.04
canonical/ubuntu_linux 20.04
canonical/ubuntu_linux 21.10
debian/debian_linux 9.0
debian/debian_linux 10.0
fedoraproject/fedora 34
qemu/qemu 0.10.0 - 6.2.0
redhat/enterprise_linux 8.0
redhat/enterprise_linux_advanced_virtualization_eus 8.4
Published Mar 23, 2022
Tracked Since Feb 18, 2026